The material in your first link was described as annealed Silver Steel, which is listed as having a hardness of 27 HRC on the Rockwell scale. That would seem too soft for an axle. Could you harden the steel? Hardening and tempering the steel with a torch sounds like it would be an enjoyable exercise, but one that requires some practice. Unless of course you have a metalworking furnace with precise temperature control.
Have you used the ejector pins in the second link? The item description isn't very descriptive of the actual steel. Are the pins hardened and ground? If so, the price sounds right for the amount of steel rod you get. 50 inches would made a lot of axles.
Last week I went shopping for scratch building materials in the same Bangkok neighborhood that we went to during your visit here. Every time I go there I find streets and alleys that are full of tiny little shops and stalls selling all kinds of useful things. I finally found a guy selling drill rod. Well, you'd think I'd won the lottery, I was so pleased. But of course, he did not not have the size I was looking for. 5/64" - yes. 2.5mm - yes. 1/8" - yes.
But 3/32"? No! Aaargh!
It only took me 15 years to find the one guy selling drill rods in Thailand, and he didn't have the right size! Doesn't he know that out of 7 billion souls on the planet, there are a few sad individuals that need 3/32" drill rods to turn into slot car axles?
i have found it fare better to buy drill blanks, these are ground to a very accurate finish These can be found in any goog tool supplier or hardware store, 3/32 dose not seem to be a problem size mac p